Joining elements with linking verbs or verbs of being suggests a completing of
the first item by the second one. Often, in fact, an equality between the
two is being set up, as the examples below illustrate.

Repair faulty parallelism with linking verbs or verbs of
being by making one element of the equation parallel to the other.

Click on the link below to complete an exercise on parallel structure with
linking verbs or verbs of being.